On Fri, 13 Oct 2023 20:12:38 +0800 Xiao Ni <xni@xxxxxxxxxx> wrote: > > > > So, it forces the calculations made by Neil back but I think that we can > > > > simply compare dev_size and data_offset between members. > > > > > > We don't need to consider the compatibility anymore in future? > > > > > Not sure if I get your question correctly. This property is supported now so > > why we should? It is already there so we are safe to set it. > > I asked because you said we can remove the check in future. So I don't > know why we don't need the check in future. The check here should be > the kernel version check, right? We are not supporting old kernels forever. At some point of time, we would decide that kernels older than 5.5 are no longer a valid case and then we will free to remove verification. If we are not supporting something older than the version where it was added, we can assume that MD_RAID0_LAYOUT is always available and we don't need to care anymore, right? Here a recent example: https://git.kernel.org/pub/scm/utils/mdadm/mdadm.git/commit/?id=f8d2c4286a Thanks, Mariusz
